text: #include "IndexPack.h"
  #include "index_pack.front.h"
  
  using namespace meta19;
  
  void pack_front_test() { //
      static_assert(pack_front<12, 13> == 12);
  }
  
  void index_pack_front_test() {
      static_assert(index_pack_front<IndexPack<12, 13>> == 12);
      static_assert(index_pack_front<IndexPack<>> == nullptr);
  }
  